byte_units.h

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// Copyright (c) 2025-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_UTIL_BYTE_UNITS_H
#define BITCOIN_UTIL_BYTE_UNITS_H
 
#include <util/overflow.h>
 
#include <limits>
#include <stdexcept>
 
namespace util::detail {
template <unsigned SHIFT>
constexpr size_t ByteUnitsToBytes(unsigned long long units, const char* exception_msg)
{
    const auto bytes{CheckedLeftShift(units, SHIFT)};
    if (!bytes || *bytes > std::numeric_limits<size_t>::max()) {
        throw std::overflow_error(exception_msg);
    }
    return *bytes;
}
} // namespace util::detail
 
constexpr size_t operator""_MiB(unsigned long long mebibytes)
{
    return util::detail::ByteUnitsToBytes<20>(mebibytes, "MiB value too large for size_t byte conversion");
}
 
constexpr size_t operator""_GiB(unsigned long long gibibytes)
{
    return util::detail::ByteUnitsToBytes<30>(gibibytes, "GiB value too large for size_t byte conversion");
}
 
#endif // BITCOIN_UTIL_BYTE_UNITS_H